EE WAS WALKING THRU A CHECK CURTAIN HE SAID HE STEPPED ON A CEMENT BLOCK LAYING IN MUD,SLIPPED OFF BLOCK. CAUSE OF INJURY WAS AWARENESSCOMPLIANCE WITH RULES/REGS NOT A FACTOR, PROTECTIVE EQUI PMENT NOT A FACTOR, MINER PROFIENCY A FACTOR, MINING EQUIP/SYSTEMS NOT A FACTOR